package com.web;

import com.pojo.Book;
import com.pojo.Page;
import com.service.BookService;
import com.service.impl.BookServiceImpl;
import com.uitl.WebUtils;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class ClientBookServlet extends BaseServlet{
    BookService bookService = new BookServiceImpl();
    //处理分页功能
    protected void page(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        System.out.println("经过了Servlet程序");
        //1、获取请求的参数：pageNo和pageSize
        int pageNo= WebUtils.parseInt(req.getParameter("pageNo"),1);
        int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
        //2、调用BookService。page(PageNo,pageSize)：返回page对象
        Page<Book> page = bookService.page(pageNo,pageSize);
        page.setUrl("client/bookServlet?action=page");//设置分页的请求地址
        //3、保存page对象到request域中
        req.setAttribute("page",page);
        //4、请求转发到page/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/client/index.jsp").forward(req,resp);
    }

    protected void pageByPrice(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//        System.out.println("经过了Servlet程序");
        //1、获取请求的参数：pageNo和pageSize
        int pageNo= WebUtils.parseInt(req.getParameter("pageNo"),1);
        int pageSize = WebUtils.parseInt(req.getParameter("pageSize"), Page.PAGE_SIZE);
        int min = WebUtils.parseInt(req.getParameter("min"),0);
        int max = WebUtils.parseInt(req.getParameter("max"),Integer.MAX_VALUE);
        //2、调用BookService。page(PageNo,pageSize)：返回page对象
        Page<Book> page = bookService.pageByPrice(pageNo,pageSize,min,max);

        //需要将价格区间追加到分页地址中，否则会出现查询后分页无法正确使用的问题
        StringBuilder sb = new StringBuilder("client/bookServlet?action=pageByPrice");
        //如果有最小价格的参数，追加到分页条的地址参数中
        if (req.getParameter("min")!=null){
            sb.append("&min=").append(req.getParameter("min"));

        }
        //如果有最大价格的参数，追加到分页条的地址参数中
        if (req.getParameter("max")!=null){
            sb.append("&max=").append(req.getParameter("max"));

        }
        page.setUrl(sb.toString());//设置分页的请求地址
        //3、保存page对象到request域中
        req.setAttribute("page",page);
        //4、请求转发到page/manager/book_manager.jsp页面
        req.getRequestDispatcher("/pages/client/index.jsp").forward(req,resp);
    }

}
